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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '328a21ab058bb32b7cd4a9ac84bd7c837a31d251ff911d0d5691a4f79c6aebb0' 
  AND token = 'tLiJTDsGGPjmL5SjixrQEftQOgCYA+W6jM7n8y40JSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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