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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f99b30e7f4d67c083aa6120b818f1dde5eced1496e8f7de3acd6cf0cb76e0498' 
  AND token = 'vTM91PYwmHqIuwOlgnHSuugrpLVQHniR4F2m8X5msGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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