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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1870355106f6ac9270adb8264352dbfe3e58477f2e5e760d72a571e5cbfa0e' 
  AND token = 'HE0/Bd7SCHPodbnoXtwQWjCAePxr4DBsAUZNz9TArnQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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