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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4d3f4c896e746f42feef1a5e698d37806bae075b3884f07107d4bce8976ff73' 
  AND token = 'i9haGy48eeTtJ/tGqH+Xv+RfcyjkqR5HB89ctG1hKkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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