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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ab11fea40e25d16ff85cff325f31637d38029cd2b60f15d3ce1a39de2ce93c1' 
  AND token = '893mzqNc05NKWJffLXk5MwRnt6ylVHga1n5blOPK9j8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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