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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a1996cc2450e2cda2a36a6f5ca1b17db9a583375abfc5d0dddc6bfcf2b552b0' 
  AND token = '2P89levAUTV2nxro6pUUk6XhmQOu0J9M6bjW/RdBrQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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