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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdcdff3fa1da2289fac2ade3343811515faa886da41e2e5c5eda6a62088c6f55' 
  AND token = 'zPYGcn6itHP1YGLru/giEROjbYprV5pIgeo+5/LrpaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}