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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fecfffcaf954635ae90739fff3c74c9eedbd8d8f9100b0dfbbffb117e036063' 
  AND token = 'FYTU0F3HpRoCOHP+wOztKo8J2EbvD0ClwIBRpgUjxHA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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