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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff656826ff49596ed7f7242aab3ed91df7a8fd214d8c40a75ff7277db6965a5' 
  AND token = 'RcnpCHI7kXyOtCep3W4LpasERHsm2LafoClCf57wL3E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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