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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbf2f5658bdaaf1185d64e8871044828808efff60b37c252e5769efc27555ef8' 
  AND token = 'qZzf8UKwgCYetsi0sGSNLUsFAWThaOR+4lu5J+K1gy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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