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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c189f87fbdab5da55f8f334e3e7a180b36ae7b0d81c06b9e2e8c66033e31045' 
  AND token = 'lJz+esoLjCWuBss4O9A0hClsbSzquHDKar6KLUXVNEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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