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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31d3cab7bce469939da576e7239df837e4eb71bd0d234322f514d724daa29da2' 
  AND token = 'Y+ibuuDm184Y4ro2A+zeJ9juC4iYOL69jhdkfVXnLTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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