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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acfc2ea6b28569d6ef3de5857d7bd7b09070fa84439eaeb24f19cd169ac3ac01' 
  AND token = 'spb7Tt7foL6iXnZjFK64wZnLXaGXu9361lw5r96M6Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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