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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31663152dfbf7293148ce7e759a3acd46d9b710d652f7a02df6c887772e2425c' 
  AND token = 'TduMSSunM2OzBMcEqEJn4XYK0cdufbMJ6hmP8Vkr9pA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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