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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2abb7418c4fe0dc88934e2214687e2f431a80922ff5b51ad3f1414aa86a538af' 
  AND token = 'Nvm0Ej211TBIV4eL3AMk5HS2607RwfTv762H+MBrvyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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