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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aee3fc58cca66e0e7787d8e9ec069530e3f3a352cf3af1407235b92942cde2c' 
  AND token = '4P/Hj+tL9oLfztJvH9BQMG27pbQZpeSjkEeN1yLZxWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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