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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1e2dca9766aef2ba7d95b48099978e17a1803a23c1b767598e5042e22304cf1' 
  AND token = 'zfAsERijRE7QpiGTSAS4a0mtTjRhIOmkMvcew4OEW7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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