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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '42437cc1c50bb79ee17f4d4e635ac5c9527f83caad35021fd24ca6e3fdc8374b' 
  AND token = 'F3aPFF9f1rH+7akAuG/MW8Yn0a7ol84Q4A+zposPGoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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