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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '878a570932b8ffeb2159d7eac17679c204d1a337bf84325b1fd8d811eec61386' 
  AND token = 'wUb4f5mcPBMeVx9842wI1Vd0I/M83hMpX79u0Sg+fpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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