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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07f53b05e7bf5905a64ca8c002bcc7a39ca1fbc28296c4f164ef0541a5545fb5' 
  AND token = '4WkPZkK9BpLkiDr2fgHs0puft+4poCUDS+v5112PFnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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