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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1e8dce0fad7062be40178ab9d5565ab0e66f5feaf78b3a81347cac6a8ac7d31' 
  AND token = 'oXTCz/KxKV0MT3ccNAMeKIex68+09lDB6Lh6nTARM4M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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