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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9ed59b19c9015fcef45e45c459f3aeab7827cbee3e02d66a42043c64c0fcd9e' 
  AND token = '1Amxa/zUouXONp8DAyzxOQw+Omb5p5vtw5L32nash0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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