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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd343b487a7bf5e98ca9a08811f4c954319bc3d552d95767dbf7c1f5244134e30' 
  AND token = 'Ib7AQFq5x3j4wfxOkeP8Ce29b3ux2O+0B5toZqFNxq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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