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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8897928c398254915b07dc894c2983554ba2efe97f8f937ad7122e0d8f80d1a2' 
  AND token = '7T8YqKjBHZFeNnM5k1pcS3DLuk20sW2UJnODLkF3p54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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