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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f083436c194710a861914a5896c790d1823e6c71167263bf886e77a42570d10' 
  AND token = 'gnPdElX+k6n3VjA0/3paZ8PSgvChQKMCmh386EaYVhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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