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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552e86b989b14bb2607b444bc171e163f31412536da53c275b48797cfd45bdf1' 
  AND token = 'OVj6Qhh1Rra3dylb3sSpC9XIcntef7ZzoU3T4tyRjq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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