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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1f4ec2fd508e28daba42ee73eeab8fb4bd2b2e96a721398518ef66492883bdf' 
  AND token = 'hyV3nLR4X5I0cA3brz72X1+HdHRehahk+mCiLA3VP6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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