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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e9b3f3aba8432924cb8b5da5f3a505c156d260f900b13050f57d7c7839e5cfa' 
  AND token = 'dXQt99K1EWiVvHxFoqRSAZFOA+ncAtw+2ZFlWkzCgQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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