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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fce031e0d81475eaf3a17496cb69ebcd21bff98665f43d2025e7e22672ee006' 
  AND token = 'oMubzLO0u/SPIkHodAl1aBm742x5/pj+ZmQkyKfBG80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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