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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a4f8485451363399ba4a6d8dcfe391ca7a77ed267a1bd91fbc22c2e81ccd67' 
  AND token = 'GGqWlb5cbvufnGnybqB14w2De5IjTcwo+C6aDZ34k/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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