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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ebfd137ac4b6cd650539514f4d5c6236a6164edbed479513e596cca0b7c5903' 
  AND token = 'qA3LPq1hO+/C28DBcRHEWiWwZe5/5N41+5KYRbB1GDY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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