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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51383c5f0838987922bd35b68c221f0d8c04b4b611e3c800effdd24cbe814647' 
  AND token = 'SkZU7TMR+9mBOYYB9Y3Ua7UOvs8NN/9clFbE+/X4j50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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