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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '298772b135269673c67b9898265edca73cea256673acae74fe1e9ad37a9e957a' 
  AND token = 'swjUvXmc99nd/KftURLOx5Ey4KkcgCcBOiskGJBvCi8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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