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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0089143b4f0d6af2860dbafa16b60000052b4b835bde212647c019d1af618c2' 
  AND token = 'o9Chs4zHHV0ToZfBDb32b7zbphPZOcPOz64ign0HF44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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