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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e0752c3afdc4392cbc38bdb14bb2c628b5aa9eb40d21ab20e242c22625a93ec' 
  AND token = 'X2cHP1/gma2x5ck8HxhTFL7TY/ppjC7vFV4AMYcdvFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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