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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51f0a0a1144b25e255940b1cc5a5bbb0a4ced7aef3335ffe72573a386fc0b8e0' 
  AND token = '7wGFVTquBjZwoFBG5oay1fl6VUifLLRriwfQ2r/crAc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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