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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1507c8aa25d348cf916f79c53809a17e77f9977739df9439955abecdb153271a' 
  AND token = 'imXUp8CKvBzpA34yP45zLmfWGOdC4rI1QPjWGoXkzgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00073

JSON explain

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