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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e14b6c092843a9961164f82a64d5482809404ef24efe9764584f388c43aa573' 
  AND token = 'x74rW8gy4miKlmuI/oSvPnhSK1yQSNtNvmNJ7jxrhxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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