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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '603a93abcf479b0650533eec2ddef7c52de6a2fb913dcb0d1d9f53fcd870fb24' 
  AND token = '2vfpceQ8SF0ZL5S0BphXCCubmkDdk14R7iglRt960uE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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