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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a50630adb536b4a116b70e41d439d35d1b6f4e97e42017ab1f0dd54732759a' 
  AND token = 'i12qm02eAkhPf6vo/yzDXiibzE26NzDPdwlmhQLHi3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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