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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e37d65b636879a26decb38d06f5c9d455e936375b974626c2d85ebf22010ddc' 
  AND token = 'p8Rq0Kemtv7vkxSil/aPT3+CxukbhR9chw51K1rZNg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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