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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb48e0b1486df5e7077a3734ba648ab83af306f2b8e050b9f5cdf5d1290f6172' 
  AND token = 'EpYy5M7o02UFujvqAGhEjUWiAftH+tJLd69rxrFqzuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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