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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97ca312fdd8d1e76a284837a0359f26f9723d9b9f5a5640f5aae9271310efd0d' 
  AND token = '89E6nGW2/i58QcnkMh0Q85GTspSum8UcYDHVdgA3fjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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