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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d376519c144dc08ef83a51968606bbbe6d0b5b11b0fc8ea9a5e0207954bd4d2' 
  AND token = '+gsbBNPznwwkkthtg6LJU67Rl13fHv09L4Bdb1J0yNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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