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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1be43089f6c4b9a0a800d8d5e4c47b4c113b4f39f9f37a05ca65a9e3684558b8' 
  AND token = 'mVJNU7lEvozmG+Z7WOpbNDgVCDWvGlc60qkMYsWUey0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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