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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '075579057494b4a963aa4fbeab888094dda3c9fe3af5c62ea4a8783aec685028' 
  AND token = 'uSCUqiUmz71ZKlCJzbp3In/3MTicr6JkEXREs2tu3rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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